Principles of spring calculations / by J. Begtrup -- Design of heavy helical springs / by E.R. Morrison -- Design of elliptic springs / by E.R. Morrison -- Design of springs for gas engine valves / by F.E. Whittlesey
Copyright-evidenceEvidence reported by ian white for item helicalelliptics00newyrich on February 2, 2007: visible notice of copyright; stated date is 1912.